Small caliber precision seamless tube
1, Overview
Small caliber precision seamless tube is a kind of seamless tube made by cold rolling, cold drawing or cold drawing + cold rolling joint process of high precision, its manufacturing process is a journey according to a series of different size requirements to start with seamless extrusion, after many times of diameter reduction and wall reduction, until the precise specifications to meet customer requirements.
After each reduction of OD process, the tube is cut, cleaned and heat treated before the next reduction process begins. In the combined process of cold drawing and cold rolling, the wall thickness is controlled by cold rolling, and the outer diameter is controlled by cold drawing, so that the production requirements of a wide range of materials and various small specifications of seamless tubes can be met. The combined process has many advantages, such as good quality of finished product, high precision of wall thickness and outer diameter, good surface quality, short processing cycle, reduced heat treatment process, energy saving, high utilization rate of tube billet, simplified specifications and so on.
2, Material
(1) Austenitic stainless steel
TP201 / TP202
TP304 / TP304L / TP304H
TP310S / TP310H
TP316 / TP316L / TP316Ti
TP321 / TP321H
TP347 / TP347H
UNS N08020 / N08028
UNS N08800
UNS N08810 / N08811
UNS N08904
(2) DSS & SDSS
UNS S31803
UNS S32205
UNS S32750
UNS S32760
UNS S32950
(3) Ferritic SS
1Cr17
10Cr17
TP430
S43000
SUS430TP
(4) Martensitic SS
0Cr13 / TP409
1Cr13 / TP410
2Cr13 / 20Cr13
3Cr13 / 30Cr13
4Cr13 / 40Cr13
S44400 / SUS444TP
S44600 / TP446-1
(5) Martensite precipitates harden stainless steel
17-4PH / S17400 / 630
(6) Semi-austenite precipitates harden stainless steel
17-7PH / S17700 / 631
PH15-7Mo / S15700 / 632
(7) Surgical implant stainless steel
TP316LVM
TP316LS
UNS S31673
UNS S31675
(8) Titanium and Titanium alloys
Gr.1 (UNS R50250)
Gr.2 (UNS R50400)
Gr.3 (UNS R50550)
Gr.4 (UNS R50700)
Gr.5 / TC4 / Ti-6Al-4V
Gr.9 / Ti-3Al-2.5V
Gr.23 (UNS R56401, Ti-6Al-4V ELI)
(9) Nickel alloys
UNS N04400
UNS N06600
UNS N06601
UNS N06003 (Alloy 80Ni20Cr)
UNS N06690
UNS N07718
UNS N08825
UNS N08031 (Alloy 31)
UNS N09925
UNS N10276 (Alloy C-276)
UNS N06022 (Alloy C-22)
(10) Nickel
Nickel 200 (N02200)
Nickel 201 (N02201)
(11) Precision alloys
4J29 / Kovar / ASTM F15
4J32 / Invar 32-5
4J36 / Invar 36
4J42 / Invar 42
(12) Refractory metal
W
Re
Ta
Mo
Nb
(13) Elemental metal
Cu
Al
Zr
Hf
(14) Functional alloys
Nitinol
NbTi alloy
NbZr alloy
3, Sizes
OD: 6.0 ~ 80.0 mm
WT: 0.50 ~ 8.0 mm
4, Applications
Because the small caliber precision seamless tube has the advantages of no oxide layer inside and outside the wall, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no cracks in flaring and flattening, so it is widely used, such as instrument sleeve connection, automobile high and low pressure fuel distributor and air conditioning filter, high-speed locomotive, heat exchanger, electronics, aviation, aerospace, navigation, oil and gas, petrochemical, precision machinery and other industries. Especially when it has high requirements on various material performance under harsh application conditions such as high temperature, strong corrosion etc, and when it has strict requirements on tube shape and dimensional accuracy and surface roughness and cleanliness and so on, small caliber precision seamless tubes are usually used, which are made of stainless steel, corrosion resistant alloy, high temperature alloy, precision alloy, electric heating alloy, functional metal materials and other special metals. This has put forward strict requirements and challenges for production equipment, process control, quality testing, performance testing and other aspects.
